cmose, welcome to Mi Yodeya, and thanks very much for bringing your question here! I hope you get useful answers to this question and that you'll also look around the site and find other material that interests you, perhaps including our 30 other bar-mitzvah questions.
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Isaac MosesFeb 10 '14 at 21:21

The first time I heard of this concept, was back in 1999 when Kirk Douglas had a second "Bar Mitzvah" which was well covered by the media. (He has since had a third בר מצוה!)
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EphraimFeb 11 '14 at 8:28

1 Answer
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The rationale behind it is that Tehillim describes a lifetime as seventy years in the verse

ימי שנותינו בהם שבעים שנה ואם בגבורות שמונים שנה

(90:10.) Thus -- the reasoning goes -- 83 is 13 years into your "second lifetime" which is as good an excuse for a kiddush as any. I do not know of any source for it prior to the twentieth century or of any book of halacha or official minhagim that quotes it, but that doesn't mean anything.

@BabySeal No, it would be every 70 years since the Tehillim says you live 70 years Therefore, you a reborn Jew, and at 83 you are 13. My father always asks the question if a 70 year need to get recircumscised?
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philipApr 24 at 12:56